Interface ImageProducer
- All Known Implementing Classes:
FilteredImageSource,MemoryImageSource,RenderableImageProducer
public interface ImageProducer
The interface for objects which can produce the image data for Images.
Each image contains an ImageProducer which is used to reconstruct
the image whenever it is needed, for example, when a new size of the
Image is scaled, or when the width or height of the Image is being
requested.
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Method Summary
Modifier and TypeMethodDescriptionvoidRegisters anImageConsumerwith theImageProducerfor access to the image data during a later reconstruction of theImage.booleanDetermines if a specifiedImageConsumerobject is currently registered with thisImageProduceras one of its consumers.voidRemoves the specifiedImageConsumerobject from the list of consumers currently registered to receive image data.voidRequests, on behalf of theImageConsumer, that theImageProducerattempt to resend the image data one more time in TOPDOWNLEFTRIGHT order so that higher quality conversion algorithms which depend on receiving pixels in order can be used to produce a better output version of the image.voidRegisters the specifiedImageConsumerobject as a consumer and starts an immediate reconstruction of the image data which will then be delivered to this consumer and any other consumer which might have already been registered with the producer.
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Method Details
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addConsumer
Registers anImageConsumerwith theImageProducerfor access to the image data during a later reconstruction of theImage. TheImageProducermay, at its discretion, start delivering the image data to the consumer using theImageConsumerinterface immediately, or when the next available image reconstruction is triggered by a call to thestartProductionmethod.- Parameters:
ic- the specifiedImageConsumer- See Also:
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isConsumer
Determines if a specifiedImageConsumerobject is currently registered with thisImageProduceras one of its consumers.- Parameters:
ic- the specifiedImageConsumer- Returns:
trueif the specifiedImageConsumeris registered with thisImageProducer;falseotherwise.
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removeConsumer
Removes the specifiedImageConsumerobject from the list of consumers currently registered to receive image data. It is not considered an error to remove a consumer that is not currently registered. TheImageProducershould stop sending data to this consumer as soon as is feasible.- Parameters:
ic- the specifiedImageConsumer
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startProduction
Registers the specifiedImageConsumerobject as a consumer and starts an immediate reconstruction of the image data which will then be delivered to this consumer and any other consumer which might have already been registered with the producer. This method differs from the addConsumer method in that a reproduction of the image data should be triggered as soon as possible.- Parameters:
ic- the specifiedImageConsumer- See Also:
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requestTopDownLeftRightResend
Requests, on behalf of theImageConsumer, that theImageProducerattempt to resend the image data one more time in TOPDOWNLEFTRIGHT order so that higher quality conversion algorithms which depend on receiving pixels in order can be used to produce a better output version of the image. TheImageProduceris free to ignore this call if it cannot resend the data in that order. If the data can be resent, theImageProducershould respond by executing the following minimum set ofImageConsumermethod calls:ic.setHints(TOPDOWNLEFTRIGHT | < otherhints >); ic.setPixels(...); // As many times as needed ic.imageComplete();- Parameters:
ic- the specifiedImageConsumer- See Also:
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